SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd359e063484ee2b79670462ac7877bab7a95c27906cf8b0feaa60d135a1353c0' 
  AND token = 'iZsl2uO0NnuVqj1hoeyPWNXNjvRgEl08JMgoBX0KfYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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