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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0c9f056082dff53fc7ca432adeb32ea691947991662525d6d797d9ddbca9daa' 
  AND token = '1gyQTUfUxjOr3qnmvpKTQ0jflrYjtscuOXamflq3K2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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