SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '674b1df96d75b2ebede7ef91fc9414e83a38ee3bdc26815f419fb554c01c3263' 
  AND token = 'I5KUu1UBNV2xhAaAXAiWG9+jCK/a/rZXOWMXjrh34zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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