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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e76f2383cf0fd2405ffa1fcd3589cedb8928729b206de297b8d722a45fcb00af' 
  AND token = '/DBH3V8HYTEC6gDb15pj3k3gfsfFDo5N5jBFoFmo4GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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