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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fd4e8ca03d07e98feb2954704961297690b725382f4cced571455452dd829de' 
  AND token = 'YREnw2utF3DNmpp0LxvTp4boNCXFkDk4Ui0CoTew5sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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