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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '464afe8eba220d8afeac6e9e1dadf75814149cb4e4ade1add0f12600e62228aa' 
  AND token = 'tJ0zwn2CE5fnNrJiIni6A6Sj/or2aFmAMfn/x09gctQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}