SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a33eb8a78b83c4a92d0be44fa3f866fb7fcb2b0577359d97b3c3bb028f888fa' 
  AND token = 'ohJg7rlX12WAsw+PVHkpLiIQsi0fTtWGmLdJKoYh+YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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