SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da61cdd1b79ef26e86970472670361441eff69bfec65236a616fa8d9112d7a29' 
  AND token = 'Cf7IkTKHwCSRpZMCcP/+RdY84u5VmYytiCvmQ/qaYYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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