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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef2a96e921c80c8c0cc7b1ed42315a5eee6e85371fe49283f23ab22e6a15942b' 
  AND token = 'ZfLfM9xVLkGE9VSMtQRN1vezVeWnlo/7ZTBgEXzswOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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