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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3d2e5f04558402aa34e712621ae7b7e39064855dcfd397d433d2169828fbf49' 
  AND token = '4D33o+T+VtLud9nHVzZTai1TVkg+eqhWmHFAunRQxes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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