SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22effa23cd4c3c62c7a5fb680c5e83aeb2d7936df9624bafa0269750e455a46d' 
  AND token = 'dBuIIYNBJVJuwLCPtX3gP/lPJM2aDLWAGEiFxTvNxQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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