SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d22768aedefe5c78c5cbe2974a04d39dcf5b24963b8e53aca118f031f153fdd' 
  AND token = 'jejXkddGYkTSyvqQIYkzcwsxtFgsYqbZBjjagVFa9x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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