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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fcdc5db794de336607c543b17e8243bd44e843f7f692eb44980972f87898cf8' 
  AND token = 'xxzJY5cnx5kAnNHZMLg/34SdHM+HckbO7xSZgmdH3ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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