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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3f9ba2f475d64d70252d8845e8aa46cd043918f4c68a92eaea86100bb3caa4c' 
  AND token = '1wR7I6nlZ+GTzGtEYmCY0hQex/7i8Ob7pLsdFW14ygo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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