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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '903ae4cae8c7d89d3c76c35cde1596ba9eec1d4ee2f1c1597e6aa60394f238cf' 
  AND token = 'mAT7WLNqS7Zzge7E/zH3mHNV2lAhlxNn7UyOBLBKSPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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