SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e37bb9c5ef4d3b4a6d9c2f9b36c4fcba93f691177c9fded4d8f35b0ece2b9476' 
  AND token = 'aOfJCsz3il/gHVF8fgEOnG6OH+uL9byqY6U8H0+BnLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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