Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd951fdea8123823aea9967bbb66138a848a85e5005f6193ca1f454d51d320b80' 
  AND token = 'B3w19SjriSD7bcLsAeHeD/gutpoesT4EKJkdNcS6h54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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