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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e029fd4d6e52c96d5969c18df1d050b0c86c5357c06ebcf8d5d44c0543d1532' 
  AND token = 'dAcyHnSUtO7aQL2RIGILU5prUZxPxDCtrYRxSi9lnb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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