SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63291e9149264ed79185f3470db2ec487630a0df42b495ec7377c55a1d6dca9a' 
  AND token = 'hu+3Uhgsn/kl86KehSffgDBasNe80wvu3G76TTnpsaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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