SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b9e5eb2de9d4f217b1d4fc8acd33e5d53eb029f686facd8619c636a54248db5' 
  AND token = 'csXdTjoYvj1IG1DxDK08k8vjH9B17gohzbPnWgLNBQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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