SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a10780712b465f3780064605dae11b034c6c2919e23a06b14f38f01f848af1b' 
  AND token = 'T13oS4whjLAZ9c4QYWgJPVuFPyWS4h8vyH2FD/W95BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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