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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f82e4a7bd1fcf2aae29bdbf60da1368ee59077d1774d5aa22bb947180f87ff89' 
  AND token = '4Ay9u7WDmb7wzPswzk8iOkXpY9qChCOiClTA5i3CQ7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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