SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87f2314828741eca8b3e2b2684ebb4a5bf335f44396aa2d63141f7519ec0759b' 
  AND token = 'gYC/7zo1faU8vZrFbGJK6+8ddO1CB3PZZTsACmCeUUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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