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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c2c3bdc0fbafcc052503e421530de99f34a327beb5be12ca539cb8d9b306c79' 
  AND token = 'J2XOZCYG/2xBkeV90M+b66X/SWu4pZ+Haw3gV3Gly78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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