SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7445b4d7dbf91df912a3af602c544a28667ca15c73435ee5cabf416b419512b2' 
  AND token = 'M8CgEuP5qldrKZylTQ+3wG9FWHghLUm2t9JfAEaZ1LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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