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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73b2e5ee08ee473166888c1128020b9a6cbcf1808b6ebc7d92b78fe7bb528e42' 
  AND token = '7WFyseg98MrfMYDF+oGosUcA8qZuPYscIFf0k8vLVfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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