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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '614426a5a144560e7d8d5056f674765bafde15aff1e95e0439e0a2e98d329c43' 
  AND token = 'YDLunSlxwHrgMKVmDHWqlo00u6TDyf+dRj5d9qxcQh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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