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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de423188ff519a51652df566d44a149e3f56d2d064c18189b669acdc3489f647' 
  AND token = 'Pf5AAuPQ3R5P2M+KziNYOcblnmk7mMKcpja2FNUsMF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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