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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '469e62ed20a2cbbdf278acdc68425ed3a4ec257b19d6eb09bee0c973cbb97dda' 
  AND token = '6OThuHt/Kl7hAKPCmmHh+O04RQitbtvkWGc8VSfdBYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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