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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2cb80d03154e6c2c8e613c41a4fc0d54023873a3fb33b5d4c92b33fbfb4f7b9' 
  AND token = '4BWhdWY3gVGMCkPz86486nb0drqrNhor39BX6STjeJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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