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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad66b71b3e376ef28bd21c824dd53faa4cb1b28c3dce3820877be1d6108bdff8' 
  AND token = 'XGGBv9AzAPyYj+MMCl65tAtn8sD/SJMonRZrtslIj7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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