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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b95805d5658885b569bb90735d8c01c68380ff0b8a6d69f37812b8d867d9887d' 
  AND token = 'eWA/IVNQlvROoiIQgzs7dnMjg6StYEpQ60GImJbEuvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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