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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f31cabe654122a96c7b39c54f55f4036df07d1ca60e8fd1d9c187433c5431bc' 
  AND token = 'CPX6fN0ZPPnL2+0vqf490y4DKOVSVrxarBMxktK9jzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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