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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fb8b1c61bef6cc3f68eb02342b84af5505762f73a5b6075bb0654fbf9b5990c' 
  AND token = '1qdtrxmp9SCcypfOa7ZEzpFIHqWqymxvVClgdvqKUNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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