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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b15791a7899034e68f1ef16828feea7432b974ad6849a32a66380d6227979894' 
  AND token = 'BkWwtTrjcW+te89FbJTFYc+KPpLJ+/lFk0DWUfDPsbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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