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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9e2382fe73f441229244555cd0b9d7d5c29866da96411dfcfa99a63a5277d58' 
  AND token = 'X4AFP4puxta8Ri7WB6fCPQrTrZkT5tq2S709mmrBKtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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