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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dd64fd24f750d46351be7e1de81c76339ec3efbe55b5d190c06e272d0230f4e' 
  AND token = '2U9kWmvuNGZCNYnzuIbOvHmjaQKsI4Yl0Rn8wakQa9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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