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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '145da7bb241ad8467d0be8aa96e8e97f857c16324c3b6e0440ce997b4f971cf2' 
  AND token = 'P1z1J+nWMxlwkTbbVr4wrRcJ3z8dShnxKl56KdKwTSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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