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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e49dd4f7d992dd43d4b13b4a6fd4358c054dd6cd73d07fd1de6b3dceee07c91f' 
  AND token = 'oDk35LGnXI8ilcuu9ZzEicTr9uwnJm9WdviHIOIs13I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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