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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88d5667e85432869de8663397e8ee5a13e3b23f560ec140b0d5826020327079e' 
  AND token = '3r40yqgUP/K5UhEnq8oHAbzqk2dD2IMA+86ODyoBc7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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