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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8bd83e9b21032bd67cdbe912e5447aa72431fca0baaea63bdbdeac539c5d303' 
  AND token = 'TgBA0P7ej/fTc1nmD0T9f8v79ydwcM/+rk7L/TjezpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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