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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9893391de6496616dfd9bf9cfe1938cb7ddfa12d9a960e5148326642f3a787dd' 
  AND token = 'Wt0sg8d+puJUZEbtWNWGQpxxVM4jeXLUtJm8A+embuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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