SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70645d50ac4ebd614a365277719c30352f1f8bd428065953f79a139b1be37c56' 
  AND token = 'Udfh3NPB47MmBDzeKJdH8GKrOzsnYLox4kHiyJ9CiHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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