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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd33709f2a679b0c8b87d308a5093cd69c856f575a9329bb9cc970ee6a3713bbd' 
  AND token = '+PyetmfEs6P4/+NVZiV55AOZj43WeAYGF3kmFWePz98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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