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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a4bc4133087956f63d06989596b04209a57ce0eb4c0b2f61624291770ccd685' 
  AND token = 'egmBTJWIge7JdsfE3AwDO7LcSCdY2vlVExZ97XSJSLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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