SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f4d2f9675cdca7299331f220c72eddbf070fcb4296e3384b67c3cf3923f9eb3' 
  AND token = 'zZUnoJLRYaRixoqtYu5CbP0IN08GgsHwf2t/KC2fi1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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