SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84ab525f8cb182e38afb5c375b06547739d7f538389d55ca946f0dc09ec2b67b' 
  AND token = 'OIqtY4CY1114Hwv8u190BsMFyl/6cc+Bs2ghnGYT20c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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