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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa057ba3a551ea86b7fbf3b6bc79a83a13e392c4d482efedc72082ffb7a69a8e' 
  AND token = '6pYKglwfQt8Ts7bKtGLKFCEya6G59aH6roVDWed8Els=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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