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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da3d08b8aa079fa2f4004815198e3cce5861032627325f747778b8509ef7e1ba' 
  AND token = 'SvHZiDCsgUDzSpIBSmkMzjLt6Ec26ERxy49lMdNzBtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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