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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c10169c353c09036a68091c9766001050d630787652428ecf6b5869bfd153d9' 
  AND token = 'ahm/6grxjU1NKoQcXNNOyNiZ2XvxGB7WvvEh0Ji3lCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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