SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '680d9f34351be5c583df50196b661d311da5f1323d358bb7b09f1975901a2f3b' 
  AND token = 'g6d+XJtNLCNBk3V1nlT5FhGPUjum3BKqqtu5N+udOiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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