SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25234ee194950e935ec6166a97890ea4febfcea670d3ed27160941d1815057b4' 
  AND token = 'o+gKfhhBAPUl6g+7YEg81ZHrH9whweGO3gNq1Xe3Rzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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