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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad8921d040ecca46ac3788df45c06308a2eed761bbc9564ee3c219f866dafdce' 
  AND token = 'DFa/7VT9JNgVqheY7yAPq4qSmBLUd+AgyvAgccAqNqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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