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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3689420e729138f124a6ed9183df9d8dd23e2d9be9ac4e8998ee7820a49ff4a9' 
  AND token = '9DK40XnO6JpurirmgSHmdEitMmICtpjkqYXaA3jdCE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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