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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3e5f79e22997ad02a97704405bd2ffd636ac6f4f00e619d9e7feff50b717d07' 
  AND token = 'XhOHFnMCBS/K4FAXqfDtQ5md5mf6ziV01MmlHyCk+Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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