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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'deb9d5c30f8e16d8d6f58731fb288104f2eddf1a7a5293c5fb87cc54b8ac39e0' 
  AND token = '6XunB4HIB85D9h0NHXBtAx35SnXg2KikDHtHXmx8Fpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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