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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64c1b75b0335e777c50b4daea2b6638c16172509193d7213ad0b8de67e81146c' 
  AND token = 'xF+JQRGl6yEEGfxwzfRquOt3Ik/CZMp52wJip6TDdCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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