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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '983e3c48d8e4b9043ad32a0d1ea3dfe7bd7f121a4e2e442a0368d8264f444f50' 
  AND token = 'HcFDj537uzkXFodh7HYVqL6kUh1Lxu5aHSJAt6Yxywc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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