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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f20fb9c6b74e975ee76badc0522c86f4cd48babf92cfe59ed1e96680342b23dd' 
  AND token = 'H02TGyqt4kS4p/TEutT0XGG4REvZKGmMOpWemEo8IJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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