SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b94d0580825abc32214d7cb177899e87b3d9a330c49af62f6e251bdfc4d801dd' 
  AND token = 'dMg2nKD3zYhtwpBMMRIuVQ4pmty9uieO9gRAfbjTvig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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