SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5aecb1a5097d94e80af08aa0da1fe68ab6b6467b354301a38cd4b9e48067a3f2' 
  AND token = 'vqP9h5ObAjBhezgcWqM/+f9WGz+h+nB5rlu2bawB55k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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