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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b98b71dce915d66b5dec606bcf1e6896dc13abccffe54d68271118ef7f29dc5' 
  AND token = 'G1pebvi1zv6sY+AJNHV9Tx3Y8nPm70xgEvxkUMnfWoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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