SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b34f3a52d1f63090da1d31cb780098d26561d6e7dd6f5851a125385723432812' 
  AND token = 'vFgQmGJjkaTVLPuimxXkeGv9WuCWACSu2hIgEnaS2Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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