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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0e9da19500f350b35d6d15d203554059408492af8c12ef7ca621983fa35beb6' 
  AND token = 'Eo52FucIxOs7YFd7PsqpNtbwbcZJpJqw9ioyfqSbYbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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