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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5214c0f56ab7b159016b6a1442ff773ff6737b8d66293720d9cc063a3db54466' 
  AND token = 'DdIMvh7EevPO3LzJttiQwiKuxAd63bJoNLmGD3ebMpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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