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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0de85dbc11028ed91f4be0e0abf51fbc54d5e12599b60090f2f2885839228472' 
  AND token = 'kr+7azNm6CReeHMaknIweqY52D3pu46OwqQZq71RTQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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