SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90ef9d0754be601b421d538ee4b9cc6791f7ce123dbfd9e2749e331f1bc182c7' 
  AND token = 'lK/Lk+EfH+gyIrEhlS61+8UuPXBL96vLrJgmGY4KS3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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