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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd05f2de20a0fee0c369f89dbaf3339edd5cf06c6657b99dd2be2cf34cb08ece6' 
  AND token = 'yyeq5O8p/Ewi6Edjw6T1MXP1ZGYJCPNwGAeaZOVDKG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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